/*
 * WPA Supplicant - driver interaction with Linux ipw2100/2200 drivers
 * Copyright (c) 2005 Zhu Yi <yi.zhu@intel.com>
 * Copyright (c) 2004 Lubomir Gelo <lgelo@cnc.sk>
 * Copyright (c) 2003-2004, Jouni Malinen <j@w1.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 *
 * Please note that ipw2100/2200 drivers change to use generic Linux wireless
 * extensions if the kernel includes support for WE-18 or newer (Linux 2.6.13
 * or newer). driver_wext.c should be used in those cases.
 */

#include "includes.h"
#include <sys/ioctl.h>

#include "wireless_copy.h"
#include "common.h"
#include "driver.h"
#include "driver_wext.h"

struct wpa_driver_ipw_data {
        void *wext; /* private data for driver_wext */
        void *ctx;
        char ifname[IFNAMSIZ + 1];
        int sock;
};

/* following definitions must be kept in sync with ipw2100.c and ipw2200.c */

#define IPW_IOCTL_WPA_SUPPLICANT                SIOCIWFIRSTPRIV+30

#define IPW_CMD_SET_WPA_PARAM                        1
#define        IPW_CMD_SET_WPA_IE                        2
#define IPW_CMD_SET_ENCRYPTION                        3
#define IPW_CMD_MLME                                4

#define IPW_PARAM_WPA_ENABLED                        1
#define IPW_PARAM_TKIP_COUNTERMEASURES                2
#define IPW_PARAM_DROP_UNENCRYPTED                3
#define IPW_PARAM_PRIVACY_INVOKED                4
#define IPW_PARAM_AUTH_ALGS                        5
#define IPW_PARAM_IEEE_802_1X                        6

#define IPW_MLME_STA_DEAUTH                        1
#define IPW_MLME_STA_DISASSOC                        2

#define IPW_CRYPT_ERR_UNKNOWN_ALG                2
#define IPW_CRYPT_ERR_UNKNOWN_ADDR                3
#define IPW_CRYPT_ERR_CRYPT_INIT_FAILED                4
#define IPW_CRYPT_ERR_KEY_SET_FAILED                5
#define IPW_CRYPT_ERR_TX_KEY_SET_FAILED                6
#define IPW_CRYPT_ERR_CARD_CONF_FAILED                7

#define        IPW_CRYPT_ALG_NAME_LEN                        16

struct ipw_param {
        u32 cmd;
        u8 sta_addr[ETH_ALEN];
        union {
                struct {
                        u8 name;
                        u32 value;
                } wpa_param;
                struct {
                        u32 len;
                        u8 reserved[32];
                        u8 data[0];
                } wpa_ie;
                struct{
                        u32 command;
                            u32 reason_code;
                } mlme;
                struct {
                        u8 alg[IPW_CRYPT_ALG_NAME_LEN];
                        u8 set_tx;
                        u32 err;
                        u8 idx;
                        u8 seq[8];
                        u16 key_len;
                        u8 key[0];
                } crypt;

        } u;
};

/* end of ipw2100.c and ipw2200.c code */

static int ipw_ioctl(struct wpa_driver_ipw_data *drv,
                     struct ipw_param *param, int len, int show_err)
{
        struct iwreq iwr;

        os_memset(&iwr, 0, sizeof(iwr));
        os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
        iwr.u.data.pointer = (caddr_t) param;
        iwr.u.data.length = len;

        if (ioctl(drv->sock, IPW_IOCTL_WPA_SUPPLICANT, &iwr) < 0) {
                int ret = errno;
                if (show_err) 
                        perror("ioctl[IPW_IOCTL_WPA_SUPPLICANT]");
                return ret;
        }

        return 0;
}


static void ipw_show_set_key_error(struct ipw_param *param)
{
        switch (param->u.crypt.err) {
        case IPW_CRYPT_ERR_UNKNOWN_ALG:
                wpa_printf(MSG_INFO, "Unknown algorithm '%s'.",
                           param->u.crypt.alg);
                wpa_printf(MSG_INFO, "You may need to load kernel module to "
                           "register that algorithm.");
                wpa_printf(MSG_INFO, "E.g., 'modprobe ieee80211_crypt_wep' for"
                           " WEP.");
                break;
        case IPW_CRYPT_ERR_UNKNOWN_ADDR:
                wpa_printf(MSG_INFO, "Unknown address " MACSTR ".",
                           MAC2STR(param->sta_addr));
                break;
        case IPW_CRYPT_ERR_CRYPT_INIT_FAILED:
                wpa_printf(MSG_INFO, "Crypt algorithm initialization failed.");
                break;
        case IPW_CRYPT_ERR_KEY_SET_FAILED:
                wpa_printf(MSG_INFO, "Key setting failed.");
                break;
        case IPW_CRYPT_ERR_TX_KEY_SET_FAILED:
                wpa_printf(MSG_INFO, "TX key index setting failed.");
                break;
        case IPW_CRYPT_ERR_CARD_CONF_FAILED:
                wpa_printf(MSG_INFO, "Card configuration failed.");
                break;
        }
}


static int ipw_set_wpa_ie(struct wpa_driver_ipw_data *drv,
                          const u8 *wpa_ie, size_t wpa_ie_len)
{
        struct ipw_param *param;
        int ret;
        size_t blen = sizeof(*param) + wpa_ie_len;

        param = os_zalloc(blen);
        if (param == NULL)
                return -1;

        param->cmd = IPW_CMD_SET_WPA_IE;
        param->u.wpa_ie.len = wpa_ie_len;
        os_memcpy(param->u.wpa_ie.data, wpa_ie, wpa_ie_len);
        
        ret = ipw_ioctl(drv, param, blen, 1);

        os_free(param);
        return ret;
}


static int ipw_set_wpa_param(struct wpa_driver_ipw_data *drv, u8 name,
                             u32 value)
{
        struct ipw_param param;

        os_memset(&param, 0, sizeof(param));
        param.cmd = IPW_CMD_SET_WPA_PARAM;
        param.u.wpa_param.name = name;
        param.u.wpa_param.value = value;

        return ipw_ioctl(drv, &param, sizeof(param), 1);
}


static int ipw_mlme(struct wpa_driver_ipw_data *drv, const u8 *addr,
                    int cmd, int reason)
{
        struct ipw_param param;

        os_memset(&param, 0, sizeof(param));
        os_memcpy(param.sta_addr, addr, ETH_ALEN);        
        param.cmd = IPW_CMD_MLME;
        param.u.mlme.command = cmd;
        param.u.mlme.reason_code = reason;

        return ipw_ioctl(drv, &param, sizeof(param), 1);
}


static int wpa_driver_ipw_set_wpa(void *priv, int enabled)
{
        struct wpa_driver_ipw_data *drv = priv;
        int ret = 0;

        wpa_printf(MSG_DEBUG, "%s: enabled=%d", __FUNCTION__, enabled);

        if (!enabled && ipw_set_wpa_ie(drv, NULL, 0) < 0)
                ret = -1;

        if (ipw_set_wpa_param(drv, IPW_PARAM_WPA_ENABLED, enabled) < 0)
                ret = -1;

        return ret;
}


static int wpa_driver_ipw_set_key(void *priv, wpa_alg alg,
                                      const u8 *addr, int key_idx, int set_tx,
                                      const u8 *seq, size_t seq_len,
                                      const u8 *key, size_t key_len)
{
        struct wpa_driver_ipw_data *drv = priv;
        struct ipw_param *param;
        u8 *buf;
        size_t blen;
        int ret = 0;
        char *alg_name;

        switch (alg) {
        case WPA_ALG_NONE:
                alg_name = "none";
                break;
        case WPA_ALG_WEP:
                alg_name = "WEP";
                break;
        case WPA_ALG_TKIP:
                alg_name = "TKIP";
                break;
        case WPA_ALG_CCMP:
                alg_name = "CCMP";
                break;
        default:
                return -1;
        }

        wpa_printf(MSG_DEBUG, "%s: alg=%s key_idx=%d set_tx=%d seq_len=%lu "
                   "key_len=%lu", __FUNCTION__, alg_name, key_idx, set_tx,
                   (unsigned long) seq_len, (unsigned long) key_len);

        if (seq_len > 8)
                return -2;

        blen = sizeof(*param) + key_len;
        buf = os_zalloc(blen);
        if (buf == NULL)
                return -1;

        param = (struct ipw_param *) buf;
        param->cmd = IPW_CMD_SET_ENCRYPTION;
        os_memset(param->sta_addr, 0xff, ETH_ALEN);
        os_strlcpy((char *) param->u.crypt.alg, alg_name,
                   IPW_CRYPT_ALG_NAME_LEN);
        param->u.crypt.set_tx = set_tx ? 1 : 0;
        param->u.crypt.idx = key_idx;
        os_memcpy(param->u.crypt.seq, seq, seq_len);
        param->u.crypt.key_len = key_len;
        os_memcpy((u8 *) (param + 1), key, key_len);

        if (ipw_ioctl(drv, param, blen, 1)) {
                wpa_printf(MSG_WARNING, "Failed to set encryption.");
                ipw_show_set_key_error(param);
                ret = -1;
        }
        os_free(buf);

        return ret;
}


static int wpa_driver_ipw_set_countermeasures(void *priv, int enabled)
{
        struct wpa_driver_ipw_data *drv = priv;
        wpa_printf(MSG_DEBUG, "%s: enabled=%d", __FUNCTION__, enabled);
        return ipw_set_wpa_param(drv, IPW_PARAM_TKIP_COUNTERMEASURES,
                                     enabled);

}


static int wpa_driver_ipw_set_drop_unencrypted(void *priv, int enabled)
{
        struct wpa_driver_ipw_data *drv = priv;
        wpa_printf(MSG_DEBUG, "%s: enabled=%d", __FUNCTION__, enabled);
        return ipw_set_wpa_param(drv, IPW_PARAM_DROP_UNENCRYPTED,
                                     enabled);
}


static int wpa_driver_ipw_deauthenticate(void *priv, const u8 *addr,
                                         int reason_code)
{
        struct wpa_driver_ipw_data *drv = priv;
        return ipw_mlme(drv, addr, IPW_MLME_STA_DEAUTH, reason_code);
}


static int wpa_driver_ipw_disassociate(void *priv, const u8 *addr,
                                       int reason_code)
{
        struct wpa_driver_ipw_data *drv = priv;
        return ipw_mlme(drv, addr, IPW_MLME_STA_DISASSOC, reason_code);
}


static int
wpa_driver_ipw_associate(void *priv, struct wpa_driver_associate_params *params)
{
        struct wpa_driver_ipw_data *drv = priv;
        int ret = 0;
        int unencrypted_eapol;

        if (ipw_set_wpa_ie(drv, params->wpa_ie, params->wpa_ie_len) < 0)
                ret = -1;
        if (wpa_driver_wext_set_ssid(drv->wext, params->ssid,
                                     params->ssid_len) < 0)
                ret = -1;
        if (wpa_driver_wext_set_bssid(drv->wext, params->bssid) < 0)
                ret = -1;

        if (params->key_mgmt_suite == KEY_MGMT_802_1X ||
            params->key_mgmt_suite == KEY_MGMT_PSK)
                unencrypted_eapol = 0;
        else
                unencrypted_eapol = 1;
        
        if (ipw_set_wpa_param(drv, IPW_PARAM_IEEE_802_1X,
                              unencrypted_eapol) < 0) {
                wpa_printf(MSG_DEBUG, "ipw: Failed to configure "
                           "ieee_802_1x param");
        }

        return ret;
}


static int wpa_driver_ipw_set_auth_alg(void *priv, int auth_alg)
{
        struct wpa_driver_ipw_data *drv = priv;
        int algs = 0;

        if (auth_alg & AUTH_ALG_OPEN_SYSTEM)
                algs |= 1;
        if (auth_alg & AUTH_ALG_SHARED_KEY)
                algs |= 2;
        if (auth_alg & AUTH_ALG_LEAP)
                algs |= 4;
        if (algs == 0)
                algs = 1; /* at least one algorithm should be set */

        wpa_printf(MSG_DEBUG, "%s: auth_alg=0x%x", __FUNCTION__, algs);
        return ipw_set_wpa_param(drv, IPW_PARAM_AUTH_ALGS, algs);
}


static int wpa_driver_ipw_get_bssid(void *priv, u8 *bssid)
{
        struct wpa_driver_ipw_data *drv = priv;
        return wpa_driver_wext_get_bssid(drv->wext, bssid);
}


static int wpa_driver_ipw_get_ssid(void *priv, u8 *ssid)
{
        struct wpa_driver_ipw_data *drv = priv;
        return wpa_driver_wext_get_ssid(drv->wext, ssid);
}


static int wpa_driver_ipw_scan(void *priv, const u8 *ssid, size_t ssid_len)
{
        struct wpa_driver_ipw_data *drv = priv;
        return wpa_driver_wext_scan(drv->wext, ssid, ssid_len);
}


static struct wpa_scan_results * wpa_driver_ipw_get_scan_results(void *priv)
{
        struct wpa_driver_ipw_data *drv = priv;
        return wpa_driver_wext_get_scan_results(drv->wext);
}


static int wpa_driver_ipw_set_operstate(void *priv, int state)
{
        struct wpa_driver_ipw_data *drv = priv;
        return wpa_driver_wext_set_operstate(drv->wext, state);
}


static void * wpa_driver_ipw_init(void *ctx, const char *ifname)
{
        struct wpa_driver_ipw_data *drv;
        int ver;

        wpa_printf(MSG_DEBUG, "%s is called", __FUNCTION__);
        drv = os_zalloc(sizeof(*drv));
        if (drv == NULL)
                return NULL;
        drv->wext = wpa_driver_wext_init(ctx, ifname);
        if (drv->wext == NULL) {
                os_free(drv);
                return NULL;
        }

        ver = wpa_driver_wext_get_version(drv->wext);
        if (ver >= 18) {
                wpa_printf(MSG_WARNING, "Linux wireless extensions version %d "
                           "detected.", ver);
                wpa_printf(MSG_WARNING, "ipw2x00 driver uses driver_wext "
                           "(-Dwext) instead of driver_ipw.");
        }

        drv->ctx = ctx;
        os_strlcpy(drv->ifname, ifname, sizeof(drv->ifname));
        drv->sock = socket(PF_INET, SOCK_DGRAM, 0);
        if (drv->sock < 0) {
                wpa_driver_wext_deinit(drv->wext);
                os_free(drv);
                return NULL;
        }

        return drv;
}


static void wpa_driver_ipw_deinit(void *priv)
{
        struct wpa_driver_ipw_data *drv = priv;
        wpa_driver_wext_deinit(drv->wext);
        close(drv->sock);
        os_free(drv);
}


const struct wpa_driver_ops wpa_driver_ipw_ops = {
        .name = "ipw",
        .desc = "Intel ipw2100/2200 driver (old; use wext with Linux 2.6.13 "
        "or newer)",
        .get_bssid = wpa_driver_ipw_get_bssid,
        .get_ssid = wpa_driver_ipw_get_ssid,
        .set_wpa = wpa_driver_ipw_set_wpa,
        .set_key = wpa_driver_ipw_set_key,
        .set_countermeasures = wpa_driver_ipw_set_countermeasures,
        .set_drop_unencrypted = wpa_driver_ipw_set_drop_unencrypted,
        .scan = wpa_driver_ipw_scan,
        .get_scan_results2 = wpa_driver_ipw_get_scan_results,
        .deauthenticate = wpa_driver_ipw_deauthenticate,
        .disassociate = wpa_driver_ipw_disassociate,
        .associate = wpa_driver_ipw_associate,
        .set_auth_alg = wpa_driver_ipw_set_auth_alg,
        .init = wpa_driver_ipw_init,
        .deinit = wpa_driver_ipw_deinit,
        .set_operstate = wpa_driver_ipw_set_operstate,
};
